Title

Investigation of the Closure and Simplified Green's Function Approximations in Second-Order Distorted-Wave Calculations for the (e, 2e) Processes

Abstract

Triple-differential cross sections for electron impact ionization of helium at 102 eV are presented for both coplanar and perpendicular plane asymmetric geometries within the framework of second-order distorted-wave theory. The closure approximation and the simplified Green's function approximation, which are currently used in the evaluation of the second-order amplitudes, are investigated and the accuracy of the approximations is examined. It is found that second-order effects are significant for this incident energy and the simplified Green's function approximation is generally more valid than the closure approximation.

Department(s)

Physics

Sponsor(s)

National Science Foundation (U.S.)

Keywords and Phrases

Atomic Excitation; Atomic Ionization; Atomic Physics; Molecular Physics; Statistical Theories; Stochastic and Trajectory Models; Transition State

International Standard Serial Number (ISSN)

0953-4075

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2007 Institute of Physics - IOP Publishing, All rights reserved.

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